[3/5] User data export: fix region snapshot replacement step saga #8557
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For user data export, read-only volume copies are attached to a Pantry so that Nexus can read from them. The region snapshot replacement machinery needs to be taught about this new location of read-only volumes: this commit represents that fix. This PR is intentionally before the others in the set that actually create the user data export objects so that this saga is fixed before that :)